Question

Calculate the power of girl who raised a bag of mass 10kg through a height of 2 m in 10 s. (Given g = 10 m/s² ) *​

Answer 1

Answer:

power= 10×10×2/10

= 20watt

Explanation:

just 20 watt

Answer 2

Answer:

Given: m= 10 kg , h = s = 2m , t =10s , g = 10m/s²

To find : Power of the girl

Solution:

m= 10 kg , h = s = 2m , t =10s , g = 10m/s² .... ( Given)

Now,

Power = Work done

__________...................(1)

time

But, Work done = F.s. Cos theta ........(2)

time = t ..........(3)

Power = F.s. Cos theta

______________

t

= ma. s. cos 0°

____________..............( Since, F= ma )

t

= 10 × 10 × 2

_________.......... ( since , cos 0° =1)

10

= 20 W or 20 watts

Therefore, the power of the girl is 20 watts